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Ranciéite

Crystal System: Hexagonal
Status of Occurrence: Confirmed Occurrence - 3rd UK recording
Distribution: Rare
Chemical Composition: Hydrated manganese oxide with calcium
Chemical Formula: (Ca,Mn2+)Mn4+4O9.3H2O
Method(s) of Verification: identification of ranciéite is by XRD (no. NMW X-1552) and EDS (Cotterell and Jenkins, 2008).

Chemical Group:

Geological Context:

Introduction: a weathering product of manganese deposits and manganese-bearing minerals, particularly in Ca-rich environments such as limestones. A solid solution series exists between ranciéite and takanelite.
Occurrence in Wales: the only account of ranciéite in Wales was made by Cotterell and Jenkins (2008) who reported the mineral occurring as stalactites in the main drainage adit at Parys Mountain, Anglesey.

Key Localities:

There are no key localities for this specimen.

References:

  1. Cotterell, T.F. & Jenkins, D.A., 2008. Ranciéite from Mynydd Parys, Amlwch, Anglesey, Wales. Journal of the Russell Society, 11, 59-63.

There are no references for this specimen.